Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Ply orientation."”.
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Structural analysis and multidisciplinary design of flexible fluid loaded composite canard
… of the structural analysis indicated that the ply orientation have a significant effect on the mechanical performance of the composite laminates such that various design objectives can be achieved just by selecting the proper arrangement of ply orientation and thickness. Three numerical …
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Analysis of After Impact Characteristics and Structural Optimization of CFRP Composite Plate
… created in MSC. PATRAN/NASTRAN to optimize the ply thickness, ply orientation, and dimensional properties of the plate to minimize the weight while abiding by the structural response constraints. Moreover, the possibility of the OpenMDAO framework in nonlinear dynamic analysis and size …
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Thermomechanical and Vibration Analysis of Stiffened Unitized Structures and Threaded Fasteners
… are presented which show the influence of ply orientation, size and orientation of the cutout, and the position and profile of the curvilinear stiffener. The numerical examples show high reliability and efficiency when compared with other published solutions and those obtained using ABAQUS, …
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Numerical Methods for Predicting the Dynamic Crushing Response and Energy Absorption of Composite Aluminum Honeycomb Sandwich Structures
… The analysis also indicates that using an angled ply orientation will lower the initial stiffness and the failure load. Future work is recommended such as performing compression tests with composite aluminum honeycomb sandwich structures and integrating delamination failure modes into the model …
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Stresses and deformations in angle-ply composite tubes
… the stresses and deformations in angle-ply composite tubes subjected to axisymmetric thermal loading. For the theoretical portion, a generalized plane strain elasticity analysis was developed. The analysis included mechanical and thermal loading and temperature-dependent material …
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Local and Global Sensitivity Analysis of Thin Ply Laminated Carbon Composites
… the interface between plies of different fiber orientation. Research has shown that decreasing ply thickness can reduce these interlaminar stress edge effects, and delay delamination in quasi-isotropic laminate specimen for laminates of equal total thickness. First ply failure stress has also …
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Shape Optimization of a Sandwich Composite Plate with Low-Velocity Impact Loading and Effect of Finite Difference Sensitivity Analysis
… load case with sizing variables (thickness and ply orientation) and shape variables (linear, quadratic, sinusoidal and Hicks-Henne bump shape function). The objective was to minimize weight while being subject to displacement or stress constraints. During the optimization process, it was found …
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Response of grooved composite laminates to out-of-plane contact loading via numerical models
… linear elastic indentor. The influence of ply angle is investigated through consideration of a family of [+/-[theta]/0]13s laminates for values of [theta] of 15°, 30°, 45°, and 60°, along with a quasiisotropic [+/-45/0/90]10s and a crossply [0/90]20s configuration, all using T700/2510 …
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Finite element-based failure analysis of composite laminates with non-destructive feature quantification.
… The first case uses the uncertainty in the ply orientation based on measurements from an ultrasound inspection to determine the probability of failure based on an extension of the classical laminate theory and the Tsai-Wu failure criteria. The probability of failure is determined by Monte …
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Evaluation of carbon fiber laminates via the use of pulse-echo ultrasound to quantify ply-stack orientation and manufacturing defects.
… challenges in the quantification of the ply stack of laminated plain-weave carbon fiber composites and the detection and sizing of foreign objects within carbon fiber laminates via the use of pulse-echo ultrasound. The first scientific contribution of this work is a method to determine …
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Buckling response of symmetrically laminated composite plates having a trapezoidal planform area
… edges of the plate are assumed to have simply supported boundary conditions, while the parallel ends are assumed to have either simply supported or clamped boundary conditions. Plates with one end being up to 3 times narrower than the other end, and the plate being up to 3 time longer than …
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Experimental and Analytical Evaluation of FRP-Retrofitted Reinforced Concrete Diaphragms for In-Plane Shear Strengthening
… FRP performance was examined as a function of ply configuration, ply orientation, anchorage type, and anchorage scheme. A diaphragm specimen database was assembled, including the eight specimens described in this thesis, five specimens from Aryan et al. (2022), and six specimens from Hutton et …